<template>
      <div class="todo-header">
        <input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title"
		@keyup.enter="add"/>
      </div>
</template>

<script>
import {nanoid} from 'nanoid'
	export default {
		name:'MyHeader',
		props:['addTodo'],
		data(){
			return{
				title:""
			}
		},
		methods:{
			add(){//校驗數據
				if(this.title.trim())return alert('輸入不能為空')
				//將用戶的輸入包裝成一個todo對象
				const todoObj = {id:nanoid(),title:this.title,done:false}//獲取輸入信息
				//通知app組件去添加一個todo對象
				this.addTodo(todoObj)
				this.title='' //輸入框清空
			}
		}
		
		}

</script>

<style scoped>
	/*header*/
	.todo-header input {
		width: 560px;
		height: 28px;
		font-size: 14px;
		border: 1px solid #ccc;
		border-radius: 4px;
		padding: 4px 7px;
	}

	.todo-header input:focus {
		outline: none;
		border-color: rgba(82, 168, 236, 0.8);
		box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
	}
</style>